package com.usian.admin.gateway.filter;

import com.alibaba.cloud.commons.lang.StringUtils;
import com.usian.admin.gateway.utils.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.log4j.Log4j2;
import org.springframework.cloud.gateway.filter.GatewayFilter;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.core.Ordered;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;
@Component
@Log4j2
public class AuthorizeFilter implements GatewayFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
//        1.获取请求对象和响应对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
//        2.判断当前的请求是否未登录，如果是直接放行
        if (request.getURI().getPath().contains("/login/in")){
//            放行
            return chain.filter(exchange);
        }
//        3.获取当前用户的请求头jwt信息
        HttpHeaders headers = request.getHeaders();
        String jwtoken = headers.getFirst("token");
//        4.判断当前令牌是否存在
        if (StringUtils.isEmpty(jwtoken)){
//            如果不存在,向客户端返回错误提示信息
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        try {
//            5.如果令牌存在,则进行解析,判断该令牌是否合法,如果不合法,则向客户端返回错误信息
            Claims claims = AppJwtUtil.getClaimsBody(jwtoken);
            int result = AppJwtUtil.verifyToken(claims);
            if (result == 0 || result == -1){
//                5.1   合法,则向header中重新设置userId
                Integer  id = (Integer) claims.get("id");
                log.info("find userid:{} from uri:{}",id,request.getURI());
//                重新设置token到header中
                ServerHttpRequest newRequest = request.mutate().header("userId",id.toString()).build();
                exchange.mutate().request(newRequest).build();
            }
        }catch (Exception e){
            e.printStackTrace();
//            向客户端返回错误提示信息
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
//        6.放行
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
